tl;dr of the article:

Over time, a multicultural society will drift toward only the most intolerant culture within it. There are myriad historic and statistical examples of this.

From a statistical perspective, Europe will be completely Muslim in 20 years.

intolerance and being a minority gives any group with those two points a large lever. with a large enough lever, one can move the earth.

Well said. A large enough lever can move anything on earth, too.